I have changed the old package version to latest version.

Author: TheveshwarJayakumar

package.json

@@ -14,41 +14,39 @@
     "@angular/router": "~10.0.0",
     "@microsoft/signalr": "5.0.9",
     "@syncfusion/ej2": "*",
-    "@syncfusion/ej2-angular-barcode-generator": "*",
-    "@syncfusion/ej2-angular-base": "*",
-    "@syncfusion/ej2-angular-buttons": "*",
-    "@syncfusion/ej2-angular-calendars": "*",
-    "@syncfusion/ej2-angular-charts": "*",
-    "@syncfusion/ej2-angular-circulargauge": "*",
-    "@syncfusion/ej2-angular-diagrams": "*",
-    "@syncfusion/ej2-angular-documenteditor": "*",
-    "@syncfusion/ej2-angular-dropdowns": "*",
-    "@syncfusion/ej2-angular-filemanager": "*",
-    "@syncfusion/ej2-angular-gantt": "*",
-    "@syncfusion/ej2-angular-grids": "*",
-    "@syncfusion/ej2-angular-heatmap": "*",
-    "@syncfusion/ej2-angular-inplace-editor": "*",
-    "@syncfusion/ej2-angular-inputs": "*",
-    "@syncfusion/ej2-angular-kanban": "*",
-    "@syncfusion/ej2-angular-layouts": "*",
-    "@syncfusion/ej2-angular-lineargauge": "*",
-    "@syncfusion/ej2-angular-lists": "*",
-    "@syncfusion/ej2-angular-maps": "*",
-    "@syncfusion/ej2-angular-navigations": "*",
-    "@syncfusion/ej2-angular-notifications": "*",
-    "@syncfusion/ej2-angular-pdfviewer": "*",
-    "@syncfusion/ej2-angular-pivotview": "*",
-    "@syncfusion/ej2-angular-popups": "*",
-    "@syncfusion/ej2-angular-progressbar": "*",
-    "@syncfusion/ej2-angular-querybuilder": "*",
-    "@syncfusion/ej2-angular-richtexteditor": "*",
-    "@syncfusion/ej2-angular-schedule": "*",
-    "@syncfusion/ej2-angular-splitbuttons": "*",
-    "@syncfusion/ej2-angular-spreadsheet": "*",
-    "@syncfusion/ej2-angular-treegrid": "*",
-    "@syncfusion/ej2-angular-treemap": "*",
-    "@syncfusion/ej2-angular-image-editor": "*",
-    "@syncfusion/ej2-react-notifications": "*",
+    "@syncfusion/ej2-angular-barcode-generator": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-buttons": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-calendars": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-charts": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-circulargauge": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-diagrams": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-documenteditor": "20.4.49-ngcc",
+    "@syncfusion/ej2-angular-dropdowns": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-filemanager": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-gantt": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-grids": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-heatmap": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-inplace-editor": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-inputs": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-kanban": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-layouts": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-lineargauge": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-lists": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-maps": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-navigations": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-notifications": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-pdfviewer": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-pivotview": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-popups": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-progressbar": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-querybuilder": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-richtexteditor": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-schedule": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-splitbuttons": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-spreadsheet": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-treegrid": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-treemap": "20.4.48-ngcc",
+    "@syncfusion/ej2-angular-image-editor": "20.4.48-ngcc",
     "@types/codemirror": "0.0.56",
     "@types/marked": "^0.3.0",
     "@types/node": "12.12.25",
@@ -145,4 +143,4 @@
     "lint": "ng lint",
     "ship-source": "gulp styles-replace && gulp copy-source"
   }
-}
+}

tsconfig.json

@@ -1,6 +1,9 @@
 {
   "compileOnSave": false,
   "compilerOptions": {
+    "paths": {
+      "@angular/*": ["./node_modules/@angular/*"]
+    },
     "baseUrl": "./",
     "outDir": "./dist/out-tsc",
     "sourceMap": true,